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SM Series Heat Pump
TROUBLESHOOTING
SM Series Water Source Heat Pump is equipped with a
externally mounted LCD screen that displays unit errors.
(Figure #64)
Figure # 64
Troubleshooting Information Solution column may
reflect a possible fault that may be one of, or a
combination of causes and solutions. Check each
cause and adopt "process of elimination" and or
verification of each before making any conclusion.
UPM Board LED Indications
Indication
Color
Blinks
GREEN
Solid
RED
1
RED
2
RED
3
RED
4
RED
5
RED
6
Compressor Ohms
Model
Start Winding
SM024
1.64
SM036
1.50
SM048
1.90
SM060
1.68
SM070
1.91
Tolerance +/- 7%. All resistance values must be
measured with compressor at room temperature.
Revised 07-17
Description
18-30 VAC Power is present
High pressure lockout
Low pressure lockout
Coax Freeze sensor lockout
Condensate overflow
Brownout
Evaporator Freeze lockout
Run Winding
1.3
0.85
0.53
0.42
0.36
Troubleshooting | 33
8733942411 (2017/06)
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